首页> 外文期刊>Structure >A structural pathway for signaling in the E46Q mutant of photoactive yellow protein
【24h】

A structural pathway for signaling in the E46Q mutant of photoactive yellow protein

机译:E46Q突变型光敏黄色蛋白信号传导的结构途径

获取原文
获取原文并翻译 | 示例
           

摘要

In the bacterial photoreceptor photoactive yellow protein (PYP), absorption of blue light by its chromophore leads to a conformational change in the protein associated with differential signaling activity, as it executes a reversible photocycle. Time-resolved Laue crystallography allows structural snapshots (as short as 150 ps) of high crystallographic resolution (1.6 Angstrom) to be taken of a protein as it functions. Here, we analyze by singular value decomposition a comprehensive time-resolved crystallographic data set of the E46Q mutant of PYP throughout the photocycle spanning 10 ns-100 ms. We identify and refine the structures of five distinct intermediates and provide a plausible chemical kinetic mechanism for their interconversion. A clear structural progression is visible in these intermediates, in which a signal generated at the chromophore propagates through a distinct structural pathway of conserved residues and results in structural changes near the N terminus, over 20 Angstrom distant from the chromophore.
机译:在细菌感光器光敏黄色蛋白(PYP)中,蓝光被其生色团吸收会导致该蛋白发生构象变化,与差异信号传导活性相关,因为它执行可逆的光循环。时间分辨Laue晶体学可以使蛋白质发挥作用时获得高晶体学分辨率(1.6埃)的结构快照(短至150 ps)。在这里,我们通过奇异值分解分析了整个光周期跨10 ns-100 ms的PYP E46Q突变体的综合时间分辨晶体学数据集。我们确定和完善五个不同的中间体的结构,并为它们的相互转化提供合理的化学动力学机制。在这些中间体中可见清晰的结构进展,其中在发色团上产生的信号通过保守的残基的独特结构途径传播,并导致在距离发色团20埃以上的N末端附近发生结构变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号